True Ground Speed Sensor (TGSS) 740
21
Appendix A
G- Storage Temperature
1.
The samples in this test were subjected to -40°C for 24 hours and then to
+85°C for another 24 hours for a total soak time of 48 hours. ASAE EP455 calls
for a minimum soak time of 4 hours at each extreme temperature. Transition
from one temperature to another was not controlled. Effects of sudden
temperature changes were performed in a separate test.
2.
Power was applied to the samples throughout the test with functional
verification being performed before the end of the elevated and reduced
temperatures.
I- Operating Temperature
Temperature Change
Rate <4 °C/min
3 hrs
3 hrs
3 hrs
3 hrs
3 hrs
4 hrs
11 hrs
30
min
1 Cycle
T
3
T
2
T
1
+85 °C
Ambient
-40 °C
On
Off
Supply Power
0
1.
The samples underwent 10 cycles while EP455 requires 1 cycle only.
2.
Power was applied as indicated on the figure above, while EP455 required
application of power throughout the test.
3.
Samples were functionally tested after soaking and while still at extreme
temperatures.
J- Thermal Shock
Parameter EP455
Requirement
Test
Performed
High temperature
+70 °C
+85 °C
Low temperature
-40 °C
-40 °C
Soak time
1 hour
1 hour
Cycles 1
10
Transfer
4 °C/min
>1 °C/min
1.
EP455 Thermal Shock test parameters with the actual test performed are
shown in table above.
2.
Utilized 2 chambers to achieve fast temperature transitions of less than 1
minute from one temperature extreme to another.
